Self-Centering Rocking Composite Frame Using Double-Skin Concrete-Filled Steel Tube Columns and Energy-Dissipating Fuses in Multiple Locations
Publication: Journal of Structural Engineering
Volume 144, Issue 9
Abstract
Self-centering rocking frame structures are high-performance seismic-resilient structures that exhibit damage in specified locations and keep the majority of structural elements elastic. Their recentering mechanism efficiently eliminates residual deformations. The present study investigated experimentally the seismic performance of a self-centering rocking composite steel/concrete frame system consisting of a braced frame with double-skin concrete-filled steel tube (CFT) columns made of ultra-high-strength (HS) steel designed to remain elastic to allow a column to rock off its foundation, and a typical all-steel moment-resisting frame (MRF). Both frames were connected at the floor levels using replaceable energy-dissipating fuses made of either conventional steel or low-yield point steel to further enhance deformation capacity. Post-tensioned (PT) steel bars that go through the inner tube of the double-skin CFT columns provide reliable self-recentering forces. An efficient shear-transfer mechanism was designed to effectively allow for uplifting behavior and prevent column base slippage. Equations to predict the base moment–frame rotation relationship of the self-centering rocking frame system were developed. Test results show that the proposed frame system reduces permanent deformations while the uplifting force is controlled by the initial post-tensioned force applied to the steel bars within a 5% margin of error. Furthermore, the proposed system exhibits a flag-shaped hysteresis loop with no residual deformation as long as the PT bars remain elastic.
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Acknowledgments
This work was partially supported by the Japan Society for Promotion of Science (JSPS) under Grant Nos. 15K18152 and 15F15066. The authors are also grateful to Dr. Masayoshi Nakashima, president of Kobori Research Complex and professor emeritus at Kyoto University, Ryusuke Enomoto of Nippon Steel and Sumikin Engineering, and Ryosuke Nishi of Kajima Corporation for their valuable assistance throughout this project. The authors also appreciate the efforts of the three anonymous reviewers to improve this paper.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 15, 2017
Accepted: Mar 30, 2018
Published online: Jun 26, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 26, 2018
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